Basing incandescent lamps.



' G. WRIGHT.

BASING INCANDESCENT LAMPS.

APPLICATION FILED FEB- 2, 1915.

R w m mm m w tw .w 0 nt t d 6? fl w ve n Db 8 AV .l. M .6 H, w m 4 6 S w 5 e 1- UNITED STATES GILBERT WRIGHT, OF SCHENECTADY, NEW YORK, ASSIGNOIR- TO GENERAL ELECTRIC PATENT OFFICE.

COMPANY, A CORPORATION OF NEW YORK.

BASING INCANDESCENT LAMPS.

, Specification of Letters Patent.

Application filed February 2, 1915. Serial No. 5,652.

cent lamps and more particularly to the bases for such lamps and means for attaching said bases to'the lamp bulbs.

In the manufacture of incandescent lamps it is necessary to provide each lamp with a base made up of metallic members having electrical connection with the leading-in wires of the lamp to make contact with the circuit which suppliesthe energy for illuminating thefi lament. In their usual form these contact members comprise a screw threaded shell which serves as one terminal and a second contact member centrally located within said shell and insulated therefrom which serves as the second contact member. It has heretofore been the general practice to secure these contact members to the lamp bulb by means of adhesive cement in which case the union between the two depends upon the adhesive qualities of the particular cement employed.

The object of my invention is to provide a means for so securing the contact members which make up the base of the lamp to the lamp bulb that the union between the two does notv depend upon adhesive action but is mechanical in its nature.

A further object of my invention is to provide a base for incandescent lamps which may be easily secured thereto in such a manner that the two members will be firmly and rigidly connected with no possibility of their separation during the normal operation of the lamp.

My invention itself with further objects and advantages thereof will be best understood by reference to the following description taken in connection with the accompanying drawing in which Figure 1 shows a complete incandescent lamp, the base of which is shown in crosssection; Fig. 2 is a perspective view of the means employed for attaching the base .to the bulb; F g. 3 is a modification thereof.

As shown in-Fig. 1 the incandescent lamp bulb 1 is provided with a recess preferably in the form of an annular groove 2 near its base. To secure the base ofthe lamp to the bulb a clamping member 3 is provided having prongs which engage this groove and to which one of the leading-in wires 4. may be connected. When this clamping member has been placed in position in the groove the base 'which comprises the screw shell 5, .the insulating member 6 and the skirt 7 is slipped over the end of the lamp bulb and the flat headed screw 8 which is adapted. to pass through a suitable threaded opening in the clamping member 3 is then tightened and the base thus securely clamped to the lamp bulb. An opening 9 may be provided in the insulating member 6 and the shell 5 through which the second leading-in wire 10 -may be drawn and fastened to the shell 5. In order to prevent any possibility of the .bulb turning with respect to the base when the lamp is turned in the socket cement 11 may be placed in the groove 2. While in this case the cement may assist in holding the base to the bulb it will be seen that the union between the two is not dependent upon I any adhesive property of the cement. In

order to prevent any tendency of the clamp-- 6 is pressing down upon them causing them to grip the bulb more closely and preventing any tendency to separate. A bushing 14 is Patented Oct. 12, 1915.

preferably provided in the opening in the insulating member 6 through which the screw passes and the end of this bushing together with the head of the screw, which is preferably flush therewith, will serve as one contact for the lamp while the shell 5 serves as the other contact. While in Figs. 1 and 2 I have shown a clamping member having only two prongs 13, it will be obvious that three prongs," as indicated in Fig. 3, may

' desired.

equally well be employed or even more if While the method of securing the base to thelamp bulb'which I have indicated and described is the 7 preferred embodiment of my invention, I do not wish to. be limited to this particular construction as it will be clear to one skilled in the art that many modifications thereof may be made without departing from the scope of the appended claimsl I What I claim, as new and desire to secure by Letters Patent of the United'States, is 1. The combination with an incandescent groove in the lamp bulb and a screw memher engagingsaid clamping member in hold-.

ing it nengagement with said insulating member and said lamp bulb.

3. The combination with an incandescent lamp bulb having an annular groove around the base'thereof, of a lamp base having a' threaded shell contact, a clamping member engaging the groove in the bulb and a screw member, the head of which is adapted to serve as a central contact, engaging said clamping member and holding it in engagement with said bulb.

4. The combination with an incandescent lamp bulb of a lamp" base having a threaded sh'ell contact, a central contact insulated therefrom and a clamping member connected to said central contact and engagingsaid bulb to secure the base to the bulb.

5. A base for an incandescent lamp comprising a threaded shell contact, a central contact insulated therefrom and a clamping member connected to said central contact and adapted to secure the base toa lamp bulb. l

6. A base for an incandescent lamp comprising a threaded shell contact, an insulating member within said contact having a central opening, a clamping member within said opening having prongs thereon adapted to engage a lamp bulb and a screw member engaging said clamping member and holding it 1n engagement with said insulating member.

' 7.. A/base for an incandescent lamp comprising a-threaded shell contact, an insulating member within said contact having a central opening with grooves in the inner surface, a clamping member engaging said grooves and having prongs thereon adapted to engage a lamp bulb and a screw member, the head of which is adapted to serve as a central contact, engaging said clamping member and holding it in engagement with said insulating member. v

p 8. A base for an incandescent lamp comprising a threaded shell contact, a central contact insulated therefrom and a clamping member connected to said centraLcontact having prongs thereon adapted to engage a lamp bulb to secure the base to said bulb.

9. 7 base for an incandescent lamp'comprising an outer contact, an insulating member within said contact, a clamping member within said insulating member and a screw member, the head of which is adapted to serve as a central contact, engaging said clamping member and holding it in engagement with said insulating member.

and a clamping member, the inner one of said contactmembers being adapted to engage with said clamping member to secure the base toa lamp bulb. v

13. The combination with an incandescent lamp bulb of a lamp base having an outer shell contact, a clamping member engaging said bulb, a screw member engaging said clamping member and holdingcit in engagement with the bulb the head of said screw member being arranged to serve as .a central contact. l

14. The combination with an incandescent lamp bulb of a lamp base comprising inner and outer contact members and a clamping member engaging said lamp bulb, the inner one of said contact members engaging said clamping member and securing the base to the bulb.

15. The combination with an incandescent lamp bulb of a lamp base comprising a clamping member engaging said bulb and two contact members, one of which is provided with screw threads which engage said clamping member and hold it in engagement with said'bulb. v

16. A base for an incandescent lamp comprising a clamping member adapted to en- In Witness whereof, I have hereunto set gage a lamp bulb and two contact members, my hand this 1st day of February, 1915. one of Which is provided With screw threads GILBERT WRIGH'L adapted to engage said clamping member Witnesses:

5 and hold it in engagement with a lamp BENJAMIN B. HULL,

bulb. HELEN ORFORD. 

